Discount:
50 shares = 0.35BTC
100 shares = 0.6 BTC
150 shares = 0.75 BTC

What discount bro?

On the 17th 50 shares were 0.28BTC

Yes, but those are the last shares Grin

You have said that a couple times.

This an entirely different unit?

This is the unit of this GB, the unit started mining on 14/02.
Last 150 shares.

Which pool?